Long post title overlapping onto second post title in sidebar

There is no code in the picture ??

No code? What part of the code do you need to see exactly?

The sidebar? Stylesheet? Or perhaps something else?

I would suggest the theme creator might have hardcoded the height of those rows. Have a look at the CSS for element the text is contained within, and see if it has a ‘height’ attribute. Get rid of this, and see what happens! If you show me a site using the template, I can probably tell you what you need to do.

What part of the code do you need to see exactly

Your blog.

My site… https://www.athique.co.uk is currently using the template so you could look at that if you like

What Ma8thew said: remove the height:

#navigation ul li a {
border-bottom: 1px solid #444444;
display: block;
text-decoration: none;
padding: 0;
margin: 0;
height: 20px;  <==== this!
}

Yep…that did it. Thanks to you both.

You could add this to your style sheet

#navigation ul li {
overflow: hidden;
}

This will hide anything that moves onto the second line.

Edit the class #navigation ul li a. Change the height attribute to auto
[EDIT]
Damn, too slow!

The overflow: hidden; attribute doesn’t seem to work for whatever reason.

What exactly does the height: auto; attribute do here?

Height:auto allows the container to expand to the height needed to show all its content without it overflowing. The height attribute defaults to auto, but I told you to define it as auto in case it inherited a different height attribute.
If you had changed to Overflow:hidden, the browser simply would have hidden any content that overflowed the container. This would not be as good as changing height to auto